GB1548362A - Active control of sound waves - Google Patents

Active control of sound waves

Info

Publication number
GB1548362A
GB1548362A GB432/75A GB43275A GB1548362A GB 1548362 A GB1548362 A GB 1548362A GB 432/75 A GB432/75 A GB 432/75A GB 43275 A GB43275 A GB 43275A GB 1548362 A GB1548362 A GB 1548362A
Authority
GB
United Kingdom
Prior art keywords
sound waves
active control
active
control
waves
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB432/75A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
National Research Development Corp UK
National Research Development Corp of India
Original Assignee
National Research Development Corp UK
National Research Development Corp of India
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by National Research Development Corp UK, National Research Development Corp of India filed Critical National Research Development Corp UK
Priority to GB432/75A priority Critical patent/GB1548362A/en
Publication of GB1548362A publication Critical patent/GB1548362A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02—Energy absorbers; Noise absorbers
    • F16L55/033—Noise absorbers
    • F16L55/0333—Noise absorbers by means of an active system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/06—Silencing apparatus characterised by method of silencing by using interference effect
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure feedback
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/111—Directivity control or beam pattern
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/112—Ducts
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3045—Multiple acoustic inputs, single acoustic output
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3046—Multiple acoustic inputs, multiple acoustic outputs
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3229—Transducers
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/50—Miscellaneous
    • G10K2210/506—Feedback, e.g. howling

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
GB432/75A 1976-04-06 1976-04-06 Active control of sound waves Expired GB1548362A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB432/75A GB1548362A (en) 1976-04-06 1976-04-06 Active control of sound waves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB432/75A GB1548362A (en) 1976-04-06 1976-04-06 Active control of sound waves

Publications (1)

Publication Number Publication Date
GB1548362A true GB1548362A (en) 1979-07-11

Family

ID=9704255

Family Applications (1)

Application Number Title Priority Date Filing Date
GB432/75A Expired GB1548362A (en) 1976-04-06 1976-04-06 Active control of sound waves

Country Status (1)

Country Link
GB (1) GB1548362A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981001480A1 (en) * 1979-11-21 1981-05-28 Sound Attenuators Ltd Improved method and apparatus for cancelling vibration
US4566118A (en) * 1981-11-26 1986-01-21 Sound Attenuators Limited Method of and apparatus for cancelling vibrations from a source of repetitive vibrations
US4589133A (en) * 1983-06-23 1986-05-13 National Research Development Corp. Attenuation of sound waves
US4669122A (en) * 1984-06-21 1987-05-26 National Research Development Corporation Damping for directional sound cancellation
GB2218301A (en) * 1988-04-29 1989-11-08 Gen Electric Co Plc Active noise control
FR2698149A1 (en) * 1992-11-16 1994-05-20 Carrier Corp Refrigerator compressor silencer responding to flow pulses - uses mobile walls inside silencer that are driven by stepper motor in response to measured input and output pulsations
EP1918201A1 (en) * 2006-10-31 2008-05-07 General Electric Company Auxiliary power unit assembly
JP2008114838A (en) * 2007-10-26 2008-05-22 General Electric Co <Ge> Auxiliary power unit assembly

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981001480A1 (en) * 1979-11-21 1981-05-28 Sound Attenuators Ltd Improved method and apparatus for cancelling vibration
US4489441A (en) * 1979-11-21 1984-12-18 Sound Attenuators Limited Method and apparatus for cancelling vibration
US4566118A (en) * 1981-11-26 1986-01-21 Sound Attenuators Limited Method of and apparatus for cancelling vibrations from a source of repetitive vibrations
US4589133A (en) * 1983-06-23 1986-05-13 National Research Development Corp. Attenuation of sound waves
US4669122A (en) * 1984-06-21 1987-05-26 National Research Development Corporation Damping for directional sound cancellation
GB2218301A (en) * 1988-04-29 1989-11-08 Gen Electric Co Plc Active noise control
US4965832A (en) * 1988-04-29 1990-10-23 The General Electric Company, P.L.C. Active noise control
GB2218301B (en) * 1988-04-29 1992-06-03 Gen Electric Co Plc Active noise control
FR2698149A1 (en) * 1992-11-16 1994-05-20 Carrier Corp Refrigerator compressor silencer responding to flow pulses - uses mobile walls inside silencer that are driven by stepper motor in response to measured input and output pulsations
EP1918201A1 (en) * 2006-10-31 2008-05-07 General Electric Company Auxiliary power unit assembly
JP2008114838A (en) * 2007-10-26 2008-05-22 General Electric Co <Ge> Auxiliary power unit assembly

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19960405